causal attire
Dress is what is meant by attire. You may receive receive an invitation specifying formal dress. That would mean formal attire. It is what you are wearing.
a dress
The beautiful dress
The Eldar Harlequins dress in clownish attire.
enrobe
The word attire refers to clothing, formal or dressy in particular.
Business attire
The dress code for the Union League Club of Chicago is business casual attire in general. Special events however require higher forms of attires, such as business dress attire.
Evening attire is nice clothing. For men, evening attire will be a nice tailored suit. For women, its a nice evening dress, usually black.
Upscale attire generally means to wear a professional outfit. This consists of dress pants, shoes, and a tucked in undershirt. For women it means to wear a gown or dress that is classy looking.
dress diaper